Computer freezes when screen plugged in.

Ginka · July 17, 2021

Hi all, it's been a while!

So I had a windows update yesterday night, did it before going to bed.
This morning when I turn on my computer, nothing shows on my DELL U3415W connected via DP to the graphic card. The screen stays black a nothing shows up, not even the motherboard logo (impossible to get into the bios).
So I do some trouble shooting:

I unplugged my DELL and instead plugged my TV on HDMI to the graphic card and no pb, things run smoothly. So I try using the same HDMI cable with my DELL, and the pb happens, all black and can't do anything.
So I then reboot everything on my TV and try adding my DELL as a second screen instead, and at the instant I plugged the DELL DP to the graphic card, the main screen (TV on HDMI) freezes. I can't move the mouse or do anything anymore (note that the screen is not black and simply freezes on what it was showing before I plug the DELL). So I unplug the DELL screen to see what happens, and everything goes back to normal. The computer unfreeze and I can use it normally again with the TV screen.
So from what I have seen, very low chances of the problem coming from the DP cable, and is either hardware related with the screen being broken, or the windows update I did yesterday fucked things up with the DELL software, or there are some other software problem with the screen...

I am really stuck here. I have no idea what to do next T.T

I am about to uninstall the windows update. Will let you know how it goes.

Update: I uninstalled the latest update, and the problem is still here T.T

chanceisreal · July 17, 2021

HI! have you tried to reinstall your graphics drivers? and does your pc have integrated graphics...maybe you can try to use the hdmi on the motherboard and see if it works like that. you could also try to revert your windows back to before the update\

Ginka · July 17, 2021

9 minutes ago, chanceisreal said:

HI! have you tried to reinstall your graphics drivers? and does your pc have integrated graphics...maybe you can try to use the hdmi on the motherboard and see if it works like that. you could also try to revert your windows back to before the update\

I have already reverted windows back to what it was before the update and nothing changed.
The hdmi works fine plugged on the GPU and my tv so no need to plugg it on the motherboard.
I will try reinstalling the graphic drivers at a later point if no better solution shows up T.T